Fill in the grid so that every row, every column, and every 3 x 3 box contains the digits 1 through 9. The specified numbers are equal to the product of there horizontally and vertically adjazent cells. (There is no extra constraint that they must be different.)

Fill in the grid so that every row, every column, and every 3 x 3 box contains the digits 1 through 9. Digits in the outside frame equal the product of the three numbers of the corresponding row or column in the contigious box.

Fill in the grid so that every row, every column, and every 3 x 3 box contains the digits 1 through 9. The digit in a oval is either the sum or the product of the digits which are marked with its arrow. The left or top cell in an oval is the tenner, the right or bottom cell is the unit of the sum or product.